platform/x86: barco-p50-gpio: use KEY_VENDOR for button instead of KEY_RESTART

It turns out that systemd-logind by default listens for KEY_RESTART input
events and reboots the machine, which isn't great - So use KEY_VENDOR for
the vendor specific identify button instead to not conflict.
Signed-off-by: NPeter Korsgaard <peter.korsgaard@barco.com>
Link: https://lore.kernel.org/r/20211022124612.19780-1-peter@korsgaard.comSigned-off-by: NHans de Goede <hdegoede@redhat.com>

drivers/platform/x86/barco-p50-gpio.c

@@ -101,7 +101,7 @@ static struct gpio_led_platform_data leds_pdata = {
 /* GPIO keyboard */
 static struct gpio_keys_button buttons[] = {
 	{
-		.code = KEY_RESTART,
+		.code = KEY_VENDOR,
 		.gpio = P50_GPIO_LINE_BTN,
 		.active_low = 1,
 		.type = EV_KEY,